REDINTEGRATION IN ALBINO RAT— A STUDY IN RETENTION 27 



But the fact is most evident that although the one trial 

 per day method evokes a more rapid reestablishment of 

 perfect integration and hence a lesser number of " errors," 

 yet the three trials per day method has relatively gained 

 in economy. This fact is illustrated in Plates I and II, 

 where it may be observed that the average " error " curves 

 tend toward a mean in redintegration. 



It has been noted that every method of learning, in 

 regard to the problem under consideration, arrives approx- 

 imately at the same end, namely, the establishment of 

 the perfectly integrated habit. That is, at the beginning 

 of the retention period — and with the exception of the 

 process or history of the establishment of integrations — the 

 three trials per day group may be considered equal to the 

 one trial per day group as far as habit integrations are 

 concerned. In integration as is here considered this seems 

 to be the fact. Otherwise there would be no tendency of 

 the " errors " of the three trials per day group and the 

 " errors " of the one trial per day group to tend to a mean, 

 as the curves in Plates I and II show graphically; and 

 likewise with the trials. In redintegration the absolute 

 number of " errors " of the one trial per day method is 

 less than the number in the three trials per day method; 

 but the relative decrease of " errors " in the three trials 

 per day redintegration is greater than in the one trial per 

 day redintegration. And thus in economy the one trial 

 per day method after retention is absolutely superior to 

 the three trials per day method, but relatively inferior. 



Tables I-C, II-C, III-C, and IV-C contain total trials 

 in learning and redintegration; and also time and perfect 

 trials in the last 15 trials of learning and the first 15 trials 

 of redintegration of those groups in the " error " tables 

 already considered. Curves (b), (c), and (d) in Plates 

 I and II are constructed from the averages in the above 

 tables. Curve (b) in both plates, showing average trials, 

 displays the tendency to a mean which appears in redin- 

 tegration totals, and further, also the superiority of the 

 one trial per day method. Curve (c) in both plates of 

 average perfect trials in the last 15 trials of learning and 

 the first 15 trials of redintegration shows no marked 



